Rail ext. are garbage they always end up bending. You need new rails
$600-rails
$1300 2.5 track
$100-$250- tunnel ext.
$100 new gearing
$130- chain
If you wanted the 3" they are $1700 plus drivers $400 or so. You can save some cash by finding used parts also.
Than your time to do the work or if your paying somebody to do the switch.
Hope you saved lots of money not buying what you wanted in the first place.
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I have yet to see a set of rail ext not bend. Hell stock rails bend often enough.
As far as gearing yeah you can leave it but your going to have to change it or clutching to make up for that extra track. No use going through all these changes and work not to turn that track efficiently.
Point is it's just easier to buy what you want than screw around with all this work. Whatever money you think you will save you will spend modding. JMO hahaha
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